I have this issue... its the relay. If I hold it right they work. If not holding it, they work some of the time. Relays are special order from a porsche parts place like... Pelican
On my SC, the relay is located in the front trunk area directly in front of the gauges. Its a black box. Enjoy!
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Michael
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'13 Cayenne GTS